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java.lang.NumberFormatException: Zero length BigInteger	at java.math.BigInteger.(BigInteger.java:302)	at org.ethereum.vm.program.invoke.ProgramInvokeFactoryImpl.createProgramInvoke(ProgramInvokeFactoryImpl.java:96)	at org.ethereum.core.TransactionExecutor.call(TransactionExecutor.java:213)	at org.ethereum.core.TransactionExecutor.execute(TransactionExecutor.java:179)	at org.ethereum.facade.EthereumImpl.callConstantImpl(EthereumImpl.java:263)	at org.ethereum.facade.EthereumImpl.callConstantFunction(EthereumImpl.java:287)	at org.ethereum.facade.EthereumImpl.callConstantFunction(EthereumImpl.java:276)